ドット区切り文字列がキーのハッシュを連想ハッシュに変換する

convert_hash.rb

hash_input = {"a.b" => "value", "a.c" => "hoge", "b.1" => "a", "a.b.c" => "aa"}
hash_output = {}

ENABLE_OVERRIDE = true

hash_input.each do |key, value|
    key_splits = key.split(".")
    current_hash = hash_output
    key_splits_tmp = key_splits.dup
    key_splits_tmp.delete_at(key_splits.size - 1) # remove last value
    key_splits_tmp.each do |key_split|
        current_hash[key_split] = {} if current_hash[key_split].nil?
        current_hash[key_split] = {} if ENABLE_OVERRIDE && !current_hash[key_split].kind_of?(Hash)
        current_hash = current_hash[key_split]
    end
    next unless ENABLE_OVERRIDE || current_hash.kind_of?(Hash) # no override
    current_hash[key_splits.last] = value
end

p hash_output

# {"a"=>{"b"=>{"c"=>"aa"}, "c"=>"hoge"}, "b"=>{"1"=>"a"}}